ZWindow *get_mixer(Mixer *&mixer);
void del_mixer(ZWindow *zwindow);
int mixer_track_active(Track *track);
void update_mixer_tracks();
void start_mixer();
int select_zwindow(ZWindow *zwindow);
ZWindow *get_mixer(Mixer *&mixer);
void del_mixer(ZWindow *zwindow);
int mixer_track_active(Track *track);
void update_mixer_tracks();
void start_mixer();
int select_zwindow(ZWindow *zwindow);